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AMDGPU: Refactor getBaseWithOffsetUsingSplitOR usage

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This commit is contained in:
Matt Arsenault 2020-11-11 12:56:22 -05:00
parent 45f4cb27da
commit 5020d4daa4
1 changed files with 51 additions and 38 deletions
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89
lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
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@ -191,6 +191,9 @@ private:
bool isUniformLoad(const SDNode *N) const;
bool isUniformBr(const SDNode *N) const;
bool isBaseWithConstantOffset64(SDValue Addr, SDValue &LHS,
SDValue &RHS) const;
MachineSDNode *buildSMovImm64(SDLoc &DL, uint64_t Val, EVT VT) const;
SDNode *glueCopyToOp(SDNode *N, SDValue NewChain, SDValue Glue) const;
@ -928,6 +931,53 @@ bool AMDGPUDAGToDAGISel::isUniformBr(const SDNode *N) const {
Term->getMetadata("structurizecfg.uniform");
}
static bool getBaseWithOffsetUsingSplitOR(SelectionDAG &DAG, SDValue Addr,
SDValue &N0, SDValue &N1) {
if (Addr.getValueType() == MVT::i64 && Addr.getOpcode() == ISD::BITCAST &&
Addr.getOperand(0).getOpcode() == ISD::BUILD_VECTOR) {
// As we split 64-bit `or` earlier, it's complicated pattern to match, i.e.
// (i64 (bitcast (v2i32 (build_vector
// (or (extract_vector_elt V, 0), OFFSET),
// (extract_vector_elt V, 1)))))
SDValue Lo = Addr.getOperand(0).getOperand(0);
if (Lo.getOpcode() == ISD::OR && DAG.isBaseWithConstantOffset(Lo)) {
SDValue BaseLo = Lo.getOperand(0);
SDValue BaseHi = Addr.getOperand(0).getOperand(1);
// Check that split base (Lo and Hi) are extracted from the same one.
if (BaseLo.getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
BaseHi.getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
BaseLo.getOperand(0) == BaseHi.getOperand(0) &&
// Lo is statically extracted from index 0.
isa<ConstantSDNode>(BaseLo.getOperand(1)) &&
BaseLo.getConstantOperandVal(1) == 0 &&
// Hi is statically extracted from index 0.
isa<ConstantSDNode>(BaseHi.getOperand(1)) &&
BaseHi.getConstantOperandVal(1) == 1) {
N0 = BaseLo.getOperand(0).getOperand(0);
N1 = Lo.getOperand(1);
return true;
}
}
}
return false;
}
bool AMDGPUDAGToDAGISel::isBaseWithConstantOffset64(SDValue Addr, SDValue &LHS,
SDValue &RHS) const {
if (CurDAG->isBaseWithConstantOffset(Addr)) {
LHS = Addr.getOperand(0);
RHS = Addr.getOperand(1);
return true;
}
if (getBaseWithOffsetUsingSplitOR(*CurDAG, Addr, LHS, RHS)) {
assert(LHS && RHS && isa<ConstantSDNode>(RHS));
return true;
}
return false;
}
StringRef AMDGPUDAGToDAGISel::getPassName() const {
return "AMDGPU DAG->DAG Pattern Instruction Selection";
}
@ -1660,37 +1710,6 @@ static MemSDNode* findMemSDNode(SDNode *N) {
llvm_unreachable("cannot find MemSDNode in the pattern!");
}
static bool getBaseWithOffsetUsingSplitOR(SelectionDAG &DAG, SDValue Addr,
SDValue &N0, SDValue &N1) {
if (Addr.getValueType() == MVT::i64 && Addr.getOpcode() == ISD::BITCAST &&
Addr.getOperand(0).getOpcode() == ISD::BUILD_VECTOR) {
// As we split 64-bit `or` earlier, it's complicated pattern to match, i.e.
// (i64 (bitcast (v2i32 (build_vector
// (or (extract_vector_elt V, 0), OFFSET),
// (extract_vector_elt V, 1)))))
SDValue Lo = Addr.getOperand(0).getOperand(0);
if (Lo.getOpcode() == ISD::OR && DAG.isBaseWithConstantOffset(Lo)) {
SDValue BaseLo = Lo.getOperand(0);
SDValue BaseHi = Addr.getOperand(0).getOperand(1);
// Check that split base (Lo and Hi) are extracted from the same one.
if (BaseLo.getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
BaseHi.getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
BaseLo.getOperand(0) == BaseHi.getOperand(0) &&
// Lo is statically extracted from index 0.
isa<ConstantSDNode>(BaseLo.getOperand(1)) &&
BaseLo.getConstantOperandVal(1) == 0 &&
// Hi is statically extracted from index 0.
isa<ConstantSDNode>(BaseHi.getOperand(1)) &&
BaseHi.getConstantOperandVal(1) == 1) {
N0 = BaseLo.getOperand(0).getOperand(0);
N1 = Lo.getOperand(1);
return true;
}
}
}
return false;
}
template <bool IsSigned>
bool AMDGPUDAGToDAGISel::SelectFlatOffset(SDNode *N,
SDValue Addr,
@ -1704,13 +1723,7 @@ bool AMDGPUDAGToDAGISel::SelectFlatOffset(SDNode *N,
(!Subtarget->hasFlatSegmentOffsetBug() ||
AS != AMDGPUAS::FLAT_ADDRESS)) {
SDValue N0, N1;
if (CurDAG->isBaseWithConstantOffset(Addr)) {
N0 = Addr.getOperand(0);
N1 = Addr.getOperand(1);
} else if (getBaseWithOffsetUsingSplitOR(*CurDAG, Addr, N0, N1)) {
assert(N0 && N1 && isa<ConstantSDNode>(N1));
}
if (N0 && N1) {
if (isBaseWithConstantOffset64(Addr, N0, N1)) {
uint64_t COffsetVal = cast<ConstantSDNode>(N1)->getSExtValue();
const SIInstrInfo *TII = Subtarget->getInstrInfo();